package com.roroldo.springcloud.service.impl;

import com.roroldo.springcloud.service.IMessageProvider;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.messaging.Source;
import org.springframework.integration.support.MessageBuilder;
import org.springframework.messaging.MessageChannel;
import javax.annotation.Resource;
import java.util.UUID;

/**
 * MessageProviderImpl
 * @author 落霞不孤
 */
// 可以理解为是一个消息的发送管道的定义
@EnableBinding(Source.class)
@Slf4j
public class MessageProviderImpl implements IMessageProvider {
    @Resource
    private MessageChannel output; // 消息的发送管道

    @Override
    public String send() {
        String serial = UUID.randomUUID().toString();
        this.output.send(MessageBuilder.withPayload(serial).build()); // 创建并发送消息
        log.info("***serial:*** " + serial);
        return serial;
    }
}
